Elitmus Exam Numerical Ability Number System

how many six digit numbers can be formed using the digits 0 to 5,without repetition such that the number is divisible by the digit at its units place?

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Elitmus Other Question

O T O
* H A S
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T I C O
C H C K
C L A I
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C O O K O O
w h y
n u t
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o o n p
o y p y
o u h a
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o n e p o p
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find the digits of each letters from
0-9. Each letter stand for each number in the above multiplication?